I have an Anthem MCA 50. It seems to be operating well, however it's developed an odd behavior. On a random interval it will click 4 to 7 times in close succession. This happens 3 or 4 times a day. There's no impact to the sound. It sounds like a relay, like when the relays that actuate when it goes into idle after 5 minutes from no signal. My thought it's a relay that's upstream to the caps and they are preventing any issues with the audio.
This is a new location, so there's a possibility that the electric supply could be causing something freaky. I moved it myself in the original boxing and it rode in the back of my SUV.